Which of the following best explains why industrialization increased dramatically in the United States during the late nineteenth century? A. Immigration and urbanization provided a surplus of cheap labor.
B. Government-mandated education led to a more well-educated populace ready and able to compete with other industrial nations.
C. The discovery of oil reserves made America the richest nation in the world.
D. State-supported universities focused primarily on providing the skills necessary for the nation's continued industrial development.